<template>
	<div class="list" ref="wrapper">
		<div>
			<div class="area">
				<div class="title border-topbottom">当前城市</div>
				<div class="button-list">
					<div class="button-wrapper">
						<div class="button">{{this.currentCity}}</div>
					</div>
				</div>
			</div>
			<div class="area">
				<div class="title  border-topbottom">热门城市</div>
				<div class="button-list">
					<div 
						class="button-wrapper"   
						v-for="item of hotCities" 
						:key="item.id"
						@click="handleCityClick(item.name)" 
					>
						<div class="button">{{item.name}}</div>
					</div>
				</div>
			</div>
			<div 
				class="area" 
				v-for="(item, key) of cities" 
				:key="key"
				:ref="key"
			>
				<div class="title border-topbottom">{{key}}</div>
				<div class="item-list">
					<div 
						class="item border-bottom"
						v-for="innerItem of item"
						:key="innerItem.id"
						@click="handleCityClick(innerItem.name)"
						>
						{{innerItem.name}}
					</div>
				</div>
			</div>
		</div>
	</div>
</template>
<script>
	import Bscroll from 'better-scroll'
	import { mapState, mapMutations } from 'vuex'

	export default {
		name: 'CityList',
		props: {
			cities: Object,
			hotCities: Array,
			letter: String
		},
		computed: {
			...mapState({
				currentCity: 'city'
			})
		},
		watch: {
			letter () {
				if (this.letter) {
					const element = this.$refs[this.letter][0]
					this.scroll.scrollToElement(element)
				}
			},
			'cities'() {
				this.$nextTick(() => {
					this._initScroll()
				})
			}
		},
		mounted() {
			this._initScroll()
		},
    methods: {
			handleCityClick(city) {
				this.changeCity(city)
				this.$router.push('/')
				console.log('wo')
			},
			...mapMutations(['changeCity']),
			_initScroll() {
				if (!this.scroll) {
					this.scroll = new Bscroll(this.$refs.wrapper, {
						click: true
					})
				} else {
					this.scroll.refresh()
				}
			}
		}
	}
</script>
<style lang="stylus" scoped>
	@import '~@/assets/styles/varibles.styl'

	.border-topbottom
		&:before
			border-color: #ccc
		&:after
			border-color: #ccc
	.border-bottom
		&:before
			border-color: #ccc
	.list
		overflow: hidden
		position: absolute
		top: 1.58rem
		left: 0
		right: 0
		bottom: 0
		.title
			line-height: .54rem
			background: #eee
			padding-left: .2rem
			color: #666
			font-size: .26rem
		.button-list
			overflow:hidden
			padding: .1rem
			.button-wrapper
				float: left
				width: 33.3%
				.button
					margin: .1rem
					padding: .1rem 0
					text-align: center
					border: .02rem solid #ccc
					border-radius: .06rem
		.item-list
			line-height: .76rem
			.item
				padding-left: .52rem
</style>